Chem

[sippen]

Hi guys i need help w/this one,
1, How many moles of CuSO4·5H2O are required to make 25.00 mL of a 0.25 M solution? (Unit is mol)
(As the volume is known to four significant figures, you should carry out your calculation to at least four significant figures, in which case the molarity of the prepared solution would actually be 0.2500 M).

2, What mass of CuSO4·5H2O will be needed to make this solution? (Unit is g) Carry out to at least four significant figures).

3, You will add the salt to a weighing boat, which you determine has a mass of 2.0877 g. What will be the reading on the balance when you have put sufficient CuSO4·5H2O in the boat? (Unit is g)
(Carry out to at least four significant figures).